m2Cygni


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. 4th Catalog of Orbits of Visual Binaries


catalogues and names m2Cyg, NSV 25756, 78 Cyg, HR 8310, HD 206827, SAO 89939, WDS 21441+2845B
constellation Cygnus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)


position, motion, parallax:

position (J2000) RA: 21h 44min 8,3sec DEC: +28 44' 35''
position (J1900) RA: 21h 39min 40,3sec DEC: +28 17' 26''
proper motion (J2000) RA: 0,231 arcsec/a DEC: -0,219 arcsec/a
radial velocity 17 km/s
note: suspected variable radial velocity
trigonometric parallax 0,049 arcsec
note (category: dynamical parallaxes): 0.052".

magnitude

visual magnitude 6,08
(original HR magnitude)

spectral / color information

spectral class G2V
B-V-magnitude 0,36 (uncertain)

double/multiple star system information

number of components of multiple star system 5
separation 2 arcsec
mag difference (of double or brightest multiple) 1,3
component ID AB
note (category: double and multiple data): See HR 8309.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 21h 44min 8,312sec DEC: +28 44' 35,27'' 1,24 arcsec source: 29
proper motion (J2000) RA: 0,0176 arcsec/a DEC: -0,219 arcsec/a source: 25
radial velocity 17 km/s source: 25
trigonometric parallax 0,049 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 80,59 latitude: -18,34
GCI unit vector (J2000) X: 0,727183 Y: -0,489852 Z: 0,480884

magnitude:

visual 6,11 (observed) source: 25
photovisual 6,1 source: 2
photographic 6,5 source: 2

spectral information:

spectral class F5 source: 29
Morgan-Keenan G2V source: 25
B-magnitude 6,68 0,05 B-V-magnitude 0,57

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 2,1 arcsec
magnitude difference between brightest and second brightest component 1,4
position angle 305

component magnitude spectral class catalogue(s)/name(s)
A 4,77 F5 m1Cygni, 78 Cyg, HR 8309, HD 206826, SAO 89940
B 6,11 F5 m2Cygni, 78 Cyg, HR 8310, HD 206827, SAO 89939

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
29 SAOJ2000
SAO on FK5 at J2000, 1989

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 21h 41min 54,183sec DEC: +28 30' 57,84'' 0,04 arcsec
position (J2000) RA: 21h 44min 8,312sec DEC: +28 44' 35,27''
proper motion J1950 (FK4) RA: 0,0174 arcsec/a DEC: -0,215 arcsec/a 0,005 arcsec/a in RA
0,006 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0176 arcsec/a DEC: -0,219 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 6,1 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class F5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 30437
Durchmusterung BD+28 4169B
Boss General Catalogue 30437
Henry Draper Catalogue 206827

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 21h 44,1min DEC: +28 45'
proper motion (J2000) RA: 0,288 arcsec/a DEC: -0,241 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1823 often 109 5,6'' 4,7 6,1 F6V G2V STF2822
1994 305 2,1''
AC 1878 11 263 35,3'' 4,7 11,5 - STF2822
1987 289 68,2''
AD 1823 24 61 217,4'' 4,7 6,9 F7V F2V STF2822
1956 52 199''
BD 1902 2 54 206,1'' 6,1 6,9 A5 STF2822
1909 53 204,7''

discoverer information:

discoverer code discoverer reference
STF2822 Struve, F.G.W. -

notes:

note Mu Cyg. P = 789yr., a = 5.32", motion direct. The A component is a double-lined spectroscopic binary. AB: H III 15. D is the principal component of ES 521.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (J1900) RA: 21h 39,7min DEC: +28 17'

magnitudes, spectral classes, orbital elements:

author: W.D. Heintz
date of observation: 1965
magnitude of component A: 4,78
magnitude of component B: 4,78
spectral class component B: F7V
spectral class component B: F7V
period [y]: 507,5
semi-major axis [arcsec]: 4,278
inclination [deg]: 76,5
node [deg]: 109,6
equinox of node: 2000
eccentricity: 0,58
time of periastron passage: 1962,5
dates of ephemeris: 1965-1990
grade: preliminary
reference: Veroff. Sternw. Munchen 7, 26; 1966.
other name(s) STF 2822, Mu Cyg